. >>> this morning, investigators in santa rosa are lookinging for a serial arsonist three buildings were targeted, two churches downtown and engineering office. lilian kim has the story. >> reporter: this is the worst of the damage doors at the catholic church downtown santa rosa charred. it could have been worse had a priest not heard the sound of the molotov cocktail shattering. the staff says he doused the fire with water as soon as he could. >> nobody has been hurt. it is the doors of the church damaged. that is a disappointment. but we'll get over that. >> reporter: investigators say whoever threw the molotov cocktail also targeted the episcopal church minutes before. no damage here, the fire department says the device failed. another molotov cocktail did ignite at the offices of a civil engineering firm. flames charred the outside of the building and melted an irrigation pipe before a janitor put the fire out. >> i think something like this happens not somebody thinking clearily or making reasonable decisions, just random target. >> reporter: investigators have collected most